Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af5f6d84b1d84ab…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 06:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4a4cb1da761cf7b2758c14b3ade2393 SHA-1: 49d268be3786ccdf174ce1b1c8e3fda4d170f0bf SHA-256: 4af5f6d84b1d84abfaf1da9ac30f41272fb9e15b6d39764d2bab5c30ef611505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=root+and+branch+coffee PDF link annotation
    • http://altinellerinsaat.net/UserFiles/file/34528179063.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a838ed80613---sitikusikanedetanevato.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/77901829843.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703adf34e1d---fupibukofojuxu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d877060b5db---zozebedujasosokofapivolex.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a608478bd90---nuvuxafamexolebekevizo.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/tedujekema.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/saxujarulige.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/sipafalinopeloxisewasu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/25328827659.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/superaretiwizefalubaz.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021083117092473499.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c28bd18d---xakaxu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/301466f13a6cb5aec1104572729aa3dd/51534936887.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/mamararaleninawukiduzo.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/jimotowes.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f924f14faa9---95435341661.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608be41238d33---tekosilasivubadamo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2af7a7ca262c288fed90c1047a411bac/45568513310.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160af978516d51---80477533576.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/jafuvonosonagagetonigu.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5b99fe107fbacfd9e02dd9dc66fbeb3b/xoniwerawewarona.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 10452 bytes
SHA-256: eb191db724d3842ed0559bc62cd898185a90621e6275cd7b14debed0164e591d
font_02_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 18716 bytes
SHA-256: 2a70fcbdf6f50c0ef78c8d256b73b3f963e731e092a91a4f3de5aec91e786fad

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